Fix Fragments Returning null Value for non-null Types

[DimuthuMadushan]

Purpose

Fixes: #7689

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility
• No commons package changes (if there are any, please update the GraphQL version in GraphQL tools and Ballerina dev tools)
• No compiler package changes (if there are any, please update the GraphQL version in Ballerina dev tools)

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.96%. Comparing base (49d4ca1) to head (e54e460).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
ballerina/response_formatter.bal	91.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2184      +/-   ##
============================================
+ Coverage     82.95%   82.96%   +0.01%     
  Complexity      824      824              
============================================
  Files           127      127              
  Lines          9866     9875       +9     
  Branches       2060     2063       +3     
============================================
+ Hits           8184     8193       +9     
  Misses         1336     1336              
  Partials        346      346              

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[ThisaruGuruge]

Approved with a minor comment.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud